Downed trees and power lines prompted road closures on state Route 900 in Issaquah and rural King County early Thursday morning.

Crews responded a downed tree and power lines before 7:50 a.m. between Northwest Talus Drive and the southern city limits. The stretch between the access road to the Talus urban village and the city line remains closed as Puget Sound Energy crews tend to the downed tree.

Outside city limits, in rural King County, the state Department of Transportation said state Route 900 is closed at Southeast May Valley Road due to a downed tree.

In Issaquah, Southeast 56th Street from 229th Avenue Southeast to East Lake Sammamish Parkway Southeast is closed due to downed power lines.

The closures came as ice weighted down trees and power lines, contributing to road closures and power outages throughout the region.

PSE reported more than 12,000 customers in the Issaquah area without power at 9:55 a.m.

Meanwhile, Gov. Chris Gregoire declared a state of emergency as the state grapples with the ice storm and digs out from a major snowstorm. The declaration could help Issaquah officials if the city applies for financial reimbursement for costs related to the winter weather incidents.

National Weather Service forecasters also extended the regional ice storm warning from noon until 2 p.m.